Fire Drill

Location: Mission 3 - Sulaco FallsAt the very end of mission 3 you will come to some sort of hangar. The relevant section for this trophy / achievement begins as soon as you enter this area. You have two minutes and thirty seconds to activate three switches and enter the dropship. It's recommended to play on the easiest difficulty (Recruit). This allows you to rush into the enemy groups without dying. Use a shotgun to take them out while running to the next switch. After all switches are activated you simply drop down and go to the dropship. The missions will end here and the trophy / achievement pops during the next cutscene. Make a backup of your save game so that you can try it again without replaying the entire mission.